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TPS61288: Question about Discharging Operation

Kwonjoon Lee
Prodigy 150 points
Part Number: TPS61288

Tool/software:

Hello.
This is Kwonjoon Lee from South Korea.

I would like to ask about TPS61288's discharging operation (triggered by the EN pin).

(Detailed Situation)

1. My TPS61288's output is connected to (a input of) TPS7A4901, and 
    my TPS61288's input voltage and target voltage are 4V and 16V, respectively.
2. I have a plan to disable TPS61288 by pulling down the EN pin to 0V before turning off the VIN of TPS61288.
(It seems that TPS61288's discharging operation triggered by the EN pin is not modeled in the SPICE model of TPS61288)

(Questions)

1. I would like to ask if TPS61288's output voltage is rapidly decreased to the input voltage (4V) of TPS61288
    when the EN is pulled down to 0V (what is a falling time?).
2. I would like to ask if TPS61288's output voltage is completely turned off (to 0V) 
    when the input voltage of TPS61288 is pulled down to 0V (what is a falling time?).

Best regards,
Kwonjoon Lee

  • +1
    TI__Genius 16325 points

    Hi Kwonjoon,

    Thank you for reaching out.

    The device TPS61288 does not have the discharge function.

    The output will decrease because of the TPS7A4901 it connected.

    so,

    1, the falling time depend on the output load, when no load, the voltage drops slowly.

    2, the input voltage drops to 0, the output will drop to 0 eventually. The falling time also depends on the output load.

    Two points need to operate the falling time.

    The TPS7A4901 working current and the leakage current of the output side.

    Best Regards,

    Fergus